侵彻单层靶时着靶姿态对装药损伤的影响规律研究

Influence of Target Attitude on Charge Damage during Penetration into a Single-Layer Target

为研究着靶姿态对高速侵彻弹装药损伤的影响,依据实际战斗部的结构尺寸设计了小尺寸模型试验弹,在125 mm口径的滑膛炮发射平台上开展了试验弹以不同攻角斜侵彻单层钢靶试验。通过理论计算得到着靶姿态对侵彻过程能量损失的影响。利用CT扫描无损检测技术观测不同着靶姿态下试验弹内部的损伤情况。运用LS-DYNA对试验弹侵彻钢靶过程中装药的力学响应过程进行模拟计算。结果表明:在斜侵彻单层钢靶的过程中,着角一定时,能量损耗与攻角呈指数关系;试验弹的倾角越大,装药尾部受到的应力波拉伸压缩反复作用越明显,装药在侵彻过程中长度变化越大,更易出现深度裂纹、塌边等损伤;壳体外形变化会引起装药受到的压缩应力阻碍微裂纹的扩展和滑移,减少宏观损伤的出现。

In order to study the effect of the target attitude on the damage of the high-speed penetrating projectile charge,a small-scale model test projectile was designed,and the test projectile was carried out on the 125 mm caliber smoothbore gun launching platform to penetrate the single projectile obliquely with different angles of attack.The influence of target attitude on energy loss during penetration process was obtained through theoretical calculation.CT scanning non-destructive testing technology was used to observe the internal damage of the test projectile under different target orientations.LS-DYNA was used to simulate and calculate the mechanical response process of the charge during the penetration of the test projectile into a steel target.The results show that,in the process of obliquely penetrating a single-layer steel target,when the angle of impact is constant,the energy loss and the angle of attack have an exponential relationship.The larger the inclination angle of the test projectile,the more obvious the repeated action of stress wave tension and compression on the tail of the charge,the greater the change in the length of the charge during the penetration process,and the more prone to damage such as deep cracks and slumps.The compressive stress of the charge caused by the change of the shell shape will hinder the expansion and slip of micro-cracks and reduce the appearance of macroscopic damage.